archival storage

[ramnam]

I am designing a project in which an archival storage room needs specialized air conditioning. The curator is asking that the room be maintained at 68 F +/- 2 F and at 45% RH +/- 2%. We have chilled water in the building (24/7). Supply temp= 45 F. Plotting the room condition on the psych chart, one would get a dew point that is nearly equal to the water temp. I'm worried that we won't have any dehumidification happening.

There is practically no load in the room. I calculated it to be 1 ton. I am afraid that if i pick a Liebert-type DX unit, the compressors will cycle to death. Does anyone have any suggestions on what kind of system to use? DX with SCR reheat? lower temp water from a modular chiller?

 

[quark]

I would strongly suggest, particularly if you have paintings, to go for a desiccant dehumidifier.

Regards,


Believe it or not : Goldbach's conjecture says any even number can be written as a sum of two prime numbers. Postulated in 16th century, nobody could, so far, prove it nor disproove it.

 

[stevenw]

i would go with the liebert unit with hot gas bypass. liebert can program the unit not to short cycle.